Transcription of EDEXCEL NATIONAL CERTIFICATE/DIPLOMA …
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EDEXCEL NATIONAL CERTIFICATE/DIPLOMA …
EDEXCEL NATIONAL CERTIFICATE/DIPLOMA . SELECTION AND APPLICATIONS OF PROGRAMMABLE LOGIC. CONTROLLERS. UNIT 25 - NQF LEVEL 3. OUTCOME 1 - SELECTION, HARDWARE AND REQUIREMENTS. TUTORIAL 2 - BASICS OF PLC TECHNOLOGY. CONTENT. 1 Understand the selection, hardware and software requirements of a programmable controller Programmable controller selection: criteria cost, versatility and scanning time; internal architecture central processing unit (CPU), arithmetic and logic unit (ALU), flags, registers, memory and types (volatile, non-volatile); scan cycle (self-test, input/logic/output scans). System hardware and software requirements: manufacturers' specification of input/output (I/O) units (digital and analogue); power supply; use of operating system; configuration of inputs and outputs; number systems binary, octal, hexadecimal, binary-coded decimal (BCD); input/output devices; mechanical switch relays (electromechanical and solid state).
The next diagram shows a very oversimplified diagram of the structure. The Central processing Unit controls everything according to a programme stored in …
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